VESSEL PROPELLING DEVICE FOR MEDIUM-SMALL SIZED VESSEL AND PROPELLER SHAFT OF VESSEL PROPELLER FOR MEDIUM-SMALL SIZED VESSEL

摘要

PROBLEM TO BE SOLVED: To provide a propeller shaft having impact proof strength and strength to rotational force, furthermore excellent in corrosion resistance in particular and moreover capable of producing with high accuracy. ;SOLUTION: This vessel propelling device for a medium-small sized vessel has a propeller 15 rotating in the vicinity of the vessel bottom and propelling a vessel 10, a rotational force generating apparatus composed of an internal combustion engine 11 or an electric motor and a propeller shaft 13 arranged between the rotational force generating apparatus and propeller 15 and transferring rotational force, and at least the part 13a in contact with outer water in the propeller shaft 13 is formed of a rolled bar stock of stainless steel composed of, by weight, 20.50 to 23.50% Cr, 11.50 to 13.50% Ni, 1.50 to 3.00% Mo, 4.00 to 6.00% Mn and 0.10 to 0.80% Cu as for the substantial component elements other than iron.;COPYRIGHT: (C)1997,JPO